noun Ophthalmology.

  1. faulty refraction of light rays by the eye, as in astigmatism or myopia.


  1. loss of ability to focus images on the retina, caused by an imperfection in the refractive function of the eye


  1. An eye abnormality, such as nearsightedness, farsightedness, or astigmatism, resulting from faulty refractive ability of the eye.
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